function addEvent(elm, evType, fn, useCapture)
{
if (elm.addEventListener)
{
elm.addEventListener(evType, fn, useCapture);
return true;
} 
else if (elm.attachEvent)
{
var r = elm.attachEvent("on"+evType, fn);
return r;
}
}

addEvent(window, "load", sortables_init);

var SORT_COLUMN_INDEX;

function sortables_init()
{
// Find all tables with class sortable and make them sortable
if (!document.getElementsByTagName)
return;

tbls = document.getElementsByTagName("table");

for (ti=0; ti<tbls.length; ti++)
{
thisTbl = tbls[ti];
if (((' '+thisTbl.className+' ').indexOf("sortable") != -1) && (thisTbl.id))
{
ts_makeSortable(thisTbl);
makeStripe(thisTbl);
}
}
}

function makeStripe(thisTbl)
{
if (!thisTbl.getElementsByTagName)
return;

rows = thisTbl.getElementsByTagName("tr");

for(var i=0; i<rows.length; i++)
rows[i].className = ((i%2)==0 ? "odd" : "even");
}

function ts_makeSortable(table)
{
if (table.rows && table.rows.length > 0)
var firstRow = table.rows[0];

if (!firstRow)
return;

// We have a first row: assume it's the header, and make its contents clickable links
for (var i=0; i<firstRow.cells.length; i++)
{
var cell = firstRow.cells[i];
if(cell.className.indexOf("unsort")==-1)
{
var txt = ts_getInnerText(cell);
cell.innerHTML = '<a href="#" class="sortheader" onclick="ts_resortTable(this);return false;">'+txt+'<span class="sortarrow"></span></a>';
}
}
}

function ts_getInnerText(el)
{
if (typeof el == "string")
return el;

if (typeof el == "undefined") { return el };

if (el.innerText)
return el.innerText;//Not needed but it is faster

var str = "";
var cs = el.childNodes;
var l = cs.length;

for (var i = 0; i < l; i++)
{
switch (cs[i].nodeType)
{
case 1: //ELEMENT_NODE
 str += ts_getInnerText(cs[i]);
 break;
case 3://TEXT_NODE
str += cs[i].nodeValue;
break;
}
}
return str;
}

function ts_resortTable(lnk) {
var span;

for (var ci=0; ci<lnk.childNodes.length; ci++)
if (lnk.childNodes[ci].tagName && lnk.childNodes[ci].tagName.toLowerCase() == 'span')
span = lnk.childNodes[ci];

var spantext = ts_getInnerText(span);
var td = lnk.parentNode;
var column = td.cellIndex;
var table = getParent(td,'TABLE');

// Work out a type for the column
if (table.rows.length <= 1)
return;

var itm = ts_getInnerText(table.rows[1].cells[column]);
//sortfn = ts_sort_numeric;
sortfn = ts_sort_caseinsensitive;

if (itm.match(/^[\d\.-]+$/))
//sortfn = ts_sort_numeric;
sortfn = ts_sort_caseinsensitive;



SORT_COLUMN_INDEX = column;

var firstRow = new Array();
var newRows = new Array();

for (i=0;i<table.rows[0].length;i++) 
firstRow[i] = table.rows[0][i];

for (j=1;j<table.rows.length;j++) 
newRows[j-1] = table.rows[j]; 

newRows.sort(sortfn);

if (span.getAttribute("sortdir") == 'down')
{
newRows.reverse();
span.setAttribute('sortdir','up');
}
else
span.setAttribute('sortdir','down');

// We appendChild rows that already exist to the tbody, so it moves them rather than creating new ones
// don't do sortbottom rows
for (i=0; i<newRows.length; i++) 
if (!newRows[i].className || (newRows[i].className && (newRows[i].className.indexOf('sortbottom') == -1)))
table.tBodies[0].appendChild(newRows[i]);

// do sortbottom rows only
for (i=0; i<newRows.length; i++)
if (newRows[i].className && (newRows[i].className.indexOf('sortbottom') != -1))
table.tBodies[0].appendChild(newRows[i]);

makeStripe(table);
}

function getParent(el, pTagName)
{
if (el == null)
return null;
else if (el.nodeType == 1 && el.tagName.toLowerCase() == pTagName.toLowerCase())// Gecko bug, supposed to be uppercase
return el;
else
return getParent(el.parentNode, pTagName);
}

function ts_sort_numeric(a,b)
{ 
aa = parseFloat(ts_getInnerText(a.cells[SORT_COLUMN_INDEX]));
if (isNaN(aa))
aa = 0;
bb = parseFloat(ts_getInnerText(b.cells[SORT_COLUMN_INDEX])); 

if (isNaN(bb))
bb = 0;

return aa-bb;
}

function ts_sort_caseinsensitive(a,b)
{
aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]).toLowerCase();
bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]).toLowerCase();

if (aa==bb)
return 0;
if (aa<bb)
return -1;

return 1;
}

function ts_sort_default(a,b)
{
aa = ts_getInnerText(a.cells[SORT_COLUMN_INDEX]);
bb = ts_getInnerText(b.cells[SORT_COLUMN_INDEX]);
if (aa==bb)
return 0;
if (aa<bb)
return -1;

return 1;
}